Following his surprise guest appearance during their Coachella performance, Polica have officially announced a that their brand new single 'Tiff' features a guest appearance from none other than Justin Vernon.

You can relive the joint Coachella performance here if you weren't lucky enough catch the show for yourself (or, if you just damn well want to see it one more time), and the single can now be streamed in full over on Polica's Soundcloud page.

'Tiff' is available to purchase now via iTunes, and keep your eyes peeled for a full LP coming from Polica later this year. Exciting!